<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <style> html, body { margin: 0px; padding: 0px; height: 100%; } </style> </head> <body>

<div class="miku"
style="
height: 50%;
width: 50%;
"></div>

<style>
.miku{
	background-color: #39c39c;
	color: white;
	box-sizing: border-box;
	border-radius: 4px;
	text-align: center;
}
</style>

</body> </html>